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Averages Quiz || DUJAT 2021 || 2 September
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Question 1
The present average age of a family of four members is 39 years. If the present age of the youngest child of the family be 13 years, the average age of the family just after the birth of that child was:
Question 2
The mean of marks secured by 50 students in division A of class X is 61, 25 students of division B is 57 and that of 50 students of division C is 55. What will be the mean of marks of the students of three divisions of Class X?
Question 3
A factory buys 10 machines. 1 Machine A, 4 Machine B and rest Machine C. Prices of the machines are Rs 90000, Rs 40000 and Rs 40000 respectively. Calculate the average cost of these machines?
Question 4
The average marks of 40 students in an examination was 34. It was later found that the marks of one student had been wrongly entered as 62 instead of 26. What is the correct average?
Question 5
What is the Average of all numbers between 100 and 200 which are divisible by 13?
Question 6
a, b and c are 3 values, such that a + b = 5, b + c = 7.5 and c + a = 8.5. What will be the average of these values?
Question 7
The average age of 120 members of a society is 60.7 years. By addition of 30 new members, the average age becomes 56.3 years. What is the average age (in years) of newly joined members?
Question 8
In a school, the average age of students is 6 yr and the average age of 12 teachers is 40 yr. If the average age of the combined group of all the teachers and students is 7 yr, then the number of students is
Question 9
The batting average of a cricket player for 64 innings is 62 runs. His highest score exceeds his lowest score by 180 runs. Excluding these two innings, the average of remaining innings becomes 60 runs. His highest score was
Question 10
The average age of A and B is 20 years if A is to be replaced by C, the average would be 19 years. The average age of C and A is 21 years. The ages of A, B and C in order (in years) are
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